Calculating-machine.



F; i. CANTRELL.

CALCULATING MACHINE.

APPLICATION mio ocT.1o, me.

Patented Dec. 25, 1917.

allai /zmfs e O JW E n ma 10 J. k m n WITNESSES:

I FRANK J. CANTRELL, OF SAN FRANCISCO, CALIFORNIA.

CALCULATINGMACHINE.

Specication of Letters Patent. Ptentgd Dec. 25, 191% Application tiled October 10, 1.916. Serial No. 124,777.

To all whom it may concern.-

Be it known that I, FRANK J. CAN'rRELL,

' a citizen of the United States, residing at the city and county ofSan Francisco and State of California, have invented new and useful Improvements in Calculating-Machines, of which the following is 'a specification.

This invention relates to a calculating machine.

In pipe fitting for steam, hot water connections, or plumbing in general, itis common practice to employ 45 elbows, 225 elbows, in fact al great variety of fittings are used extensively on different jobs. It

therefore often becomes necessary to measure pipe lengths of triangular connections. Sometimes it is necessary to determine the hypotenuse, and in several instances either the short or the long leg of the triangle.

It is'not very often that mechanics have mastered mathematics sutliciently to be able to figure the square root in order to find the hypotenuse of a triangle, similarly it is equally diliicult to determine either side of a triangle. v

The object of the present invention is to provide a simple, substantial calculating machine particularly adapted for determining any side of a triangle where one side and the angle of the hypotenuse is given.

Further objects will hereinafter appear.

The invention consists of the parts and the construction and combination of parts as hereinafter more fully described and claimed, having reference to the accompanying drawing, in which:-

Figure 1 is a cross section of the calculating machine.

Fig. 2 is a diagrammatic view showing the relation of two pipes desired to be connected.

Fig. 3 is a side elevation of the calculating machine.

Fig. 4 is a view of the table showing the long leg dimensions.

Fig. 5 is a similar view of the table showing` the short leg dimensions.

ig. 6 is a similar view. showing the hypotenuse dimensions. i

Referring to the drawings in detail, A indicates a triangular shaped casing consistin of three connected side members 2, 3 an 4, in each of which is formed an elongated window or reading slot 5. Forming a closure for this casing is a pau' of end sections 6 and extending through said end sections and the triangular casing as a. whole, 1s a shaft 7 on the outer ends of which are secured turning knobs 8. J our-k naled between the end sections 6 are three pairs of shafts, 9, l0 and 11, each pair belng positioned adjacent a reading slot 5, and each shaft is provided with a roller 12 which carries a chart such as shown in Figs. 4, 5 and 6. The rollers 9 carry the chart shown in Fig. 4 which contains the long leg dimensions of a triangle, the rollers 11, thevchart shown in Fig'. 5 which contains the short leg dimensions, rollers 10, and the chart shown in Fig. 6 which contains the hypotenuse dimensions.

. Mounted on one end of the shaft 7 interior of the casing is a spur gear 13, and mounted on each roller shaft is a pinion 14 which intermeshes with the gear 13. Turning movement transmitted to Shaft 7 through either knob 8, causes the gear 13 to turn in one direction or the other, and simultaneously tranmits movement to all the intermeshing pinions 14 to turn these in unison with same. The chart carrying rollers 9, 10 and 11 will therefore turn in unison and move the individual charts across the reading slots 5, a

-strip 16 being placed below each reading and each chart may be provided with di- The side4 evo mensions commencing with one inch, and

continuing up to as many feet asdesired.

One of the essential features ofthe present invention is "the `moving of a plurality of charts'in unison, and positively maintaining a fixed relation between the said, charts at all tim'es. If the charts are all wound about one4 roller, the relation between the same shouldbe such that the first line ofV each chart stands in register with the coperating rea-ding slot. line 6 of one chart is in register with the readin slide, then line 6 of the other charts must so be in register with their coperat- If the charts are turned until v ing reading slots. The provision of. the single driving gear 13 together with the intermeshing pinions 14, forms the necessary mechanism whereby a uniform movement and positive relation between the several charts is secured. This positive and direct drive, while limiting the extent of movement of the charts by reason of the diderences in the radii of the coils as the charts are wound from one roll to the other, affords an accurate and durable operating mechanism for the three charts to actuate each suiiiciently far to accomplish the desired computations.

The use of the instrument can better be described by referring to the piping diagram shown in Fig. 2. If it is desired to connect the pipe-indicated at 20 with the pipe 21, it becomes necessary to measure the length of the' hypotenuse of the triangle indicated by dotted lines. This is easily accomplished in the present -instance by either measuring the long leg or the short legl of the triangle.

f the long le measures 2 ft. 8 inches (2 8) vthe length of the hypotenuse can be determined by turning the charts until 2 8 on the long leg chart is in register with the reading slot 5.

If the angle happens to be it will only be necessary to look through the reading slot on the hypotenuse side under 45. The length of the hypotenuse will here be found to be 2 103. This operation is practically speaking instantaneous, as the only operation required is the turning of the central shaft by means of the knobs 8. If the hypotenuse of 2 10g is known, and it is desired to determine the short leg of the triangle, it is only necessary to turn the charts until 2 10% comes into register with the reading slot on the hypotenuse side. The corresponding short leg of the same angle 'will then be in register with the reading slot formed on the`short leg side of the casing. This reading shows l 1%.

A calculating machine or instrument constructed as here shown is so simple and positive in action and so easily operated that mistakes can hardly .be made. lIt furtheropening,

Vdimensions are required and measured in the usual manner, are entirely obviated.

The materials and finish of the several parts of the instrument may otherwise be such as the experience and judgment of the manufacturer may dictate.

I wish it understood that various changes in form, proportions and minor details of construction may bev resorted to within the scope of the appended claim, and that I do not wish to limit myself to the specific design or construction here shown.

Having thus described my invention, what I claim and desire to secure by Letters' Patent is A calculator tool for use by plumbers and the like in determining triangles, composed of a casing having a triangular cross section so that its sides conform to the sides and base of a triangle, each side having a sight openin with the respective legends JLong leg, hort leg and Hypotenuse associated therewith, a curtain for each sight the curtains bearing corresponding legends and havin correlated dimension markings of varying sized triangles whereby when one dimension of a triangle is presented at its sight opening the remaining side dimensions of the triangle will be presented at the other two, sight openings, and meansto operate the curtains in unison.

In testimony'whereof I have hereunto set m hand in the presence of two subscribing wltnesses.

l FRANK J. CANTRELL.

, Witnesses:

JOHN H. HERRING, W. W. HEALinY. 

